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Static and dynamic X Y -like short-range order in a frustrated magnet with exchange disorder

Author(s): Ross, Kathryn A.; Krizan, Jason W.; Rodriguez-Rivera, Jose A.; Cava, Robert Joseph; Broholm, Collin L.

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Abstract: A single crystal of the Co2+-based pyrochlore NaCaCo2F7 was studied by inelastic neutron scattering. This frustrated magnet with quenched exchange disorder remains in a strongly correlated paramagnetic state down to 1/60th of the Curie-Weiss temperature. Below Tf=2.4 K, diffuse elastic scattering develops and comprises 30±10% of the total magnetic scattering, as expected for Jeff=1/2 moments frozen on a time scale that exceeds /δE=3.8 ps. The diffuse scattering is consistent with short range XY antiferromagnetism with a correlation length of 16 Å. The momentum (Q) dependence of the inelastic intensity indicates relaxing XY-like antiferromagnetic clusters at energies below ∼5.5 meV, and collinear antiferromagnetic fluctuations above this energy. The relevant XY configurations form a continuous manifold of symmetry-related states. Contrary to well-known models that produce this continuous manifold, order-by-disorder does not select an ordered state in NaCaCo2F7 despite evidence for weak (∼12%) exchange disorder. Instead, NaCaCo2F7 freezes into short range ordered clusters that span this manifold. © 2016 American Physical Society.
Publication Date: Jan-2016
Electronic Publication Date: 22-Jan-2016
Citation: Ross, K.A., Krizan, J.W., Rodriguez-Rivera, J.A., Cava, R.J., Broholm, C.L. (2016). Static and dynamic -like short-range order in a frustrated magnet with exchange disorder. Physical Review B, 93 (1), 10.1103/PhysRevB.93.014433
DOI: doi:10.1103/PhysRevB.93.014433
ISSN: 2469-9950
EISSN: 2469-9969
Pages: 93.1:01443-1 - 014433-8
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. This is an open access article.
Notes: Physical Review B. Volume 93, Issue 1, 22 January 2016, Article number 014433.

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